Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 45, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 10, 2021, 4:56 PM MST for Maricopa County, Arizona. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 10, 2021, 4:56 PM MST (23:56 UTC)
- Expired
- Aug 10, 2021, 5:45 PM MST
- In force
- 49 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 120 km from the middle of the area, began a volume at 23:56 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 12:00Z, 11.9 hours before the alert went out and 88 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 110 J/kg
- Mixed-layer CIN
- -193 J/kg
- Mixed-layer LCL
- 1490 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
554
WUUS55 KPSR 102356
SVRPSR
AZC013-110045-
/O.NEW.KPSR.SV.W.0045.210810T2356Z-210811T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
456 PM MST Tue Aug 10 2021
The National Weather Service in Phoenix has issued a
* Severe Thunderstorm Warning for...
Maricopa County in south central Arizona...
* Until 545 PM MST.
* At 456 PM MST, a severe thunderstorm was located near Wickenburg,
moving southwest at 10 mph.
HAZARD...60 mph wind gusts. Small hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Wickenburg, Circle City and Morristown.
This includes the following highways...
US Highway 60 between mile markers 100 and 127.
AZ Route 74 between mile markers 1 and 7.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3398 11269 3392 11244 3377 11257 3388 11296
3400 11285 3400 11273
TIME...MOT...LOC 2356Z 023DEG 8KT 3395 11269
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
AJ1 follow-up statement
384
WWUS55 KPSR 110008
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
508 PM MST Tue Aug 10 2021
AZC013-110045-
/O.CON.KPSR.SV.W.0045.000000T0000Z-210811T0045Z/
Maricopa AZ-
508 PM MST Tue Aug 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM MST
FOR MARICOPA COUNTY...
At 506 PM MST, a severe thunderstorm was located near Wickenburg,
moving southwest at 10 mph.
HAZARD...60 mph wind gusts. Small hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Wickenburg, Circle City and Morristown.
This includes the following highways...
US Highway 60 between mile markers 100 and 127.
AZ Route 74 between mile markers 1 and 7.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move indoors to sturdy shelter immediately. Very
heavy rain will accompany the storm and may cause flooding of
streets and low lying areas.
&&
LAT...LON 3398 11269 3392 11244 3377 11257 3388 11296
3400 11285 3400 11273
TIME...MOT...LOC 0006Z 023DEG 8KT 3393 11270
HAIL...<.75IN
WIND...60MPH
$$
AJThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 5:24 PM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Aug 9, 5:44 PM MST | Special Weather Statement | PSR | La Paz | 46 min |
| Aug 9, 6:22 PM MST | Special Weather Statement | PSR | 38 min | |
| Aug 9, 10:11 PM MST | Special Weather Statement | PSR | Gila | 34 min |
| Aug 9, 10:40 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 9, 11:51 PM MST | Flash Flood Warning | PSR | Maricopa | 8 hr |
| Aug 10, 1:40 AM MST | Special Weather Statement | PSR | Maricopa | 50 min |
| Aug 10, 1:54 AM MST | Special Weather Statement | PSR | Maricopa | 51 min |
| Aug 10, 2:15 AM MST | Special Weather Statement | PSR | Maricopa | 45 min |
| Aug 10, 2:23 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 2 hr |
| Aug 10, 4:27 AM MST | Special Weather Statement | PSR | La Paz | 48 min |
| Aug 10, 5:07 AM MST | Special Weather Statement | PSR | La Paz | 53 min |
| Aug 10, 5:09 AM MST | Areal Flood Advisory | PSR | La Paz | 2 hr |
| Aug 10, 5:52 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 5 hr |
| Aug 10, 6:21 AM MST | Special Weather Statement | PSR | La Paz | 39 min |
| Aug 10, 7:39 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Aug 10, 8:00 AM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Aug 10, 8:06 AM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Aug 10, 8:30 AM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 7 hr |
| Aug 10, 9:54 AM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Aug 10, 3:05 PM MST | Areal Flood Warning | PSR | Maricopa, Pinal | 7 hr |
| Aug 10, 4:43 PM MST | Special Weather Statement | PSR | 62 min | |
| Aug 10, 4:44 PM MST | Special Weather Statement | PSR | 61 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.